Filler for concrete structures, concrete structure, and production method therefor

Abstract

A filler for a concrete structure is provided. The filler includes an organic-inorganic composite hydrogel (A). The organic-inorganic composite hydrogel (A) has a three-dimensional network structure that includes a polymer of a water-soluble organic monomer and includes a water-swellable clay mineral. The filler has a water pressure resistance of 0.2 MPa or greater. The filler for a concrete structure has excellent workability and various excellent physical properties in terms of, for example, adhesion to wet surfaces and resistance to water pressure. Accordingly, the filler is suitable for use as a filler for joints and cracks of concrete structural objects.

1 . A filler for a concrete structure, the filler comprising an organic-inorganic composite hydrogel (A), the organic-inorganic composite hydrogel (A) having a three-dimensional network structure that includes a polymer of a water-soluble organic monomer and includes a water-swellable clay mineral, the filler having a water pressure resistance of 0.2 MPa or greater. 
     
     
         2 . The filler for a concrete structure according to  claim 1 , wherein essential materials from which the organic-inorganic composite hydrogel (A) is formed include a water-soluble organic monomer, a water-swellable clay mineral, a polymerization initiator, and water. 
     
     
         3 . A concrete structure in which the filler for a concrete structure according to  claim 1  fills a gap in a concrete structural object or is disposed on a surface of the concrete structural object. 
     
     
         4 . A method for producing the filler for a concrete structure according to  claim 1 , the method comprising forming the organic-inorganic composite hydrogel (A) in a gap in a concrete structural object or on a surface of the concrete structural object. 
     
     
         5 . A method for producing a concrete structure, the method comprising filling a gap in a concrete structural object with the filler obtained by using the method according to  claim 4 .